/*
 * Copyright 2014 NAVER Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.navercorp.pinpoint.collector.cluster.zookeeper;

import org.apache.commons.lang3.StringUtils;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;

/**
 * @author koo.taejin
 */
public final class ZookeeperUtils {

    private static final String ZOOKEEPER_PATH_SEPARATOR = "/";

    // would be a good idea to move to commons-hbase (if implemented) in the future
    private ZookeeperUtils() {
    }

    public static boolean isConnectedEvent(WatchedEvent event) {
        KeeperState state = event.getState();
        EventType eventType = event.getType();

        return isConnectedEvent(state, eventType);
    }

    public static boolean isConnectedEvent(KeeperState state, EventType eventType) {
        if ((state == KeeperState.SyncConnected || state == KeeperState.NoSyncConnected) && eventType == EventType.None) {
            return true;
        } else {
            return false;
        }
    }

    public static boolean isDisconnectedEvent(WatchedEvent event) {
        KeeperState state = event.getState();
        EventType eventType = event.getType();

        return isDisconnectedEvent(state, eventType);
    }

    public static boolean isDisconnectedEvent(KeeperState state, EventType eventType) {
        if ((state == KeeperState.Disconnected || state == KeeperState.Expired) && eventType == eventType.None) {
            return true;
        } else {
            return false;
        }
    }

    public static String bindingPathAndNode(String path, String zNodeName) {
        return bindingPathAndNode(path, zNodeName, ZOOKEEPER_PATH_SEPARATOR);
    }

    public static String bindingPathAndNode(String path, String zNodeName, String pathSeparator) {
        StringBuilder fullPath = new StringBuilder(StringUtils.length(path) + StringUtils.length(zNodeName) + 1);

        fullPath.append(path);
        if (!path.endsWith(pathSeparator)) {
            fullPath.append(pathSeparator);
        }
        fullPath.append(zNodeName);

        return fullPath.toString();
    }

}
